*The numbers in parentheses are the number of compounds
of each type foundin "Structure and Properties of Inorganic Solids" by
Francis Galasso, Pergammon Press(1970).

The fluorite structure can be generated by starting with
a FCC lattice of Ca andfilling all of the tetrahedral holes with F.

It is generally easy to incorporate some vacancies on
the anion sublattice, some ofthese compounds, such as Zr1-xYxO2-x/2
(otherwise known as yttrium stabilizedzirconia), find widspread use as oxygen ion conductors.

The so-called antifluorite structure is analogous to the
fluorite structure, with thecations and anions reversed (i.e. Na2O).